<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JQuery的简单使用</title>
<!--    页面引入JQuery-->
    <script src="https://code.jquery.com/jquery-3.7.1.js"></script>
</head>
<body>
    <div>hello JQuery</div>
<script>
    $('div').hide();
</script>
</body>
</html>